Python yield example - Fibonacci

fibonacci.py

"""Print Fibonacci series using generator"""

import argparse
import textwrap


def fibonacci(number):
    """Fibonacci series generator"""
    previous, current = 0, 1
    counter = 0

    while counter < number:
        yield current
        previous, current = current, current + previous
        counter += 1


def main():
    """Main function"""
    parser = argparse.ArgumentParser(
        formatter_class=argparse.RawDescriptionHelpFormatter,
        description='Print Fibonacci series',
        epilog=textwrap.dedent('''\
            $python fibonacci.py 10
            1 1 2 3 5 8 13 21 34 55
        ''')
    )

    parser.add_argument(
        'number',
        metavar='N',
        type=int,
        help='Size of Fibonacci series')

    args = parser.parse_args()
    for num in fibonacci(args.number):
        print num,
    print


if __name__ == '__main__':
    main()